Szczegóły publikacji
Opis bibliograficzny
Effects of doping with selected rare-earth elements ($Eu^{3+}$, $Dy^{3+}$, $Eu^{3+}/Dy^{3+}$) on the structural characteristics as well as electrical and luminescent properties of $K_{0.5}Na_{0.5}NbO_{3}$ / Marta LUBSZCZYK, Tomasz BRYLEWSKI, Krzysztof Konieczny, Andrzej Kruk // Journal of Alloys and Compounds ; ISSN 0925-8388. — 2024 — vol. 996 art. no. 174814, s. 1–18. — Bibliogr. s. 15–18, Abstr. — Publikacja dostępna online od: 2024-05-14
Autorzy (4)
- AGHLubszczyk Marta
- AGHBrylewski Tomasz
- Konieczny Krzysztof
- Kruk Andrzej
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 153375 |
|---|---|
| Data dodania do BaDAP | 2024-06-10 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.jallcom.2024.174814 |
| Rok publikacji | 2024 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Journal of Alloys and Compounds |
Abstract
The effects of adding Eu3+, Dy3+, and Eu3+/Dy3+ rare-earth elements on the microstructural, optical and electrical properties of lead-free piezoelectric materials based on K0.5Na0.5NbO3 (KNN) were investigated. A series of fine powders were synthesized via a modified Pechini route utilizing citric acid. Relatively large amounts of rare-earth elements were successfully incorporated into the crystal lattice of KNN. A combination of X-ray diffraction, X-ray absorption spectroscopy, energy-dispersive X-ray and scanning electron microscopy were used to characterize the structure and chemical composition of the powders and sinters. XRD patterns indicated the formation of a single-phase orthorhombic structure in the co-doped sinter. X-ray absorption spectroscopy revealed the nominal 3+ valence states of Eu and Dy in KNN ceramic sinters. The Mott model and group symmetry theory were used to discuss the characteristics of Raman spectra obtained for the EuDy:KNN ceramics. The ceramics exhibited good dielectric permittivity (ε≃1300) and low dielectric loss (tan δ=0.03) in the temperature range of 170–240°C. The electrical properties of the ceramics showed that the basic mechanism of conduction and relaxation was thermal activation, and that small polaron hopping was responsible for charge carrying. The Eu3+ and Dy3+ ions displayed characteristic red and orange emissions in sinters when excited with light in the wide ultraviolet spectra range (380–420 nm).
